/**
 * jQuery插件：文字图片滚动
 * 
 * @author  kxbdSuperMarquee
 * @url     http://www.kxbd.com/
 * @name    jquery.marquee.js
 * @since   2011-5-18 17:30:50
 */
(function($){
    $.fn.kxbdSuperMarquee = function(options){
        var opts = $.extend({},$.fn.kxbdSuperMarquee.defaults, options);
        return this.each(function(){
            var $marquee = $(this);//滚动元素容器
            var _scrollObj = $marquee.get(0);//滚动元素容器DOM
            var scrollW = $marquee.width();//滚动元素容器的宽度
            var scrollH = $marquee.height();//滚动元素容器的高度
            var $element = $marquee.children(); //滚动元素
            var $kids = $element.children();//滚动子元素
            var scrollSize=0;//滚动元素尺寸
            var _type = (opts.direction == 'left' || opts.direction == 'right') ? 1:0;//滚动类型，1左右，0上下
            var scrollId, rollId, isMove, marqueeId;
            var t,b,c,d,e; //滚动动画的参数,t:当前时间，b:开始的位置，c:改变的位置，d:持续的时间，e:结束的位置
            var _size, _len; //子元素的尺寸与个数
            var $nav,$navBtns;
            var arrPos = [];
            var numView = 0; //当前所看子元素
            var numRoll=0; //轮换的次数
            var numMoved = 0;//已经移动的距离
            //防止滚动子元素比滚动元素宽而取不到实际滚动子元素宽度
            $element.css(_type?'width':'height',10000);
            //获取滚动元素的尺寸
            var navHtml = '<ul>';
            if (opts.isEqual) {
                _size = $kids[_type?'outerWidth':'outerHeight']();
                _len = $kids.length;
                scrollSize = _size * _len;
                for(var i=0;i<_len;i++){
                    arrPos.push(i*_size);
                    navHtml += '<li>'+ (i+1) +'</li>';
                }
            }else{
                $kids.each(function(i){
                    arrPos.push(scrollSize);
                    scrollSize += $(this)[_type?'outerWidth':'outerHeight']();
                    navHtml += '<li>'+ (i+1) +'</li>';
                });
            }
            navHtml += '</ul>';

            //滚动元素总尺寸小于容器尺寸，不滚动
            if (scrollSize<(_type?scrollW:scrollH)) return;
            //克隆滚动子元素将其插入到滚动元素后，并设定滚动元素宽度
            $element.append($kids.clone()).css(_type?'width':'height',scrollSize*2);

            //轮换导航
            if (opts.navId) {
                $nav = $(opts.navId).append(navHtml).hover( stop, start );
                $navBtns = $('li', $nav);
                $navBtns.each(function(i){
                    $(this).bind(opts.eventNav,function(){
                        if(isMove) return;
                        if(numView==i) return;
                        rollFunc(arrPos[i]);
                        $navBtns.eq(numView).removeClass('navOn');
                        numView = i;
                        $(this).addClass('navOn');
                    });
                });
                $navBtns.eq(numView).addClass('navOn');
            }

            //设定初始位置
            if (opts.direction == 'right' || opts.direction == 'down') {
                _scrollObj[_type?'scrollLeft':'scrollTop'] = scrollSize;
            }else{
                _scrollObj[_type?'scrollLeft':'scrollTop'] = 0;
            }

            if(opts.isMarquee){
                //滚动开始
                //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                //鼠标划过停止滚动
                $marquee.hover(
                    function(){
                        clearInterval(marqueeId);
                    },
                    function(){
                        clearInterval(marqueeId);
                        //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                        marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                    }
                    );
                //控制加速运动
                if(opts.controlBtn){
                    $.each(opts.controlBtn, function(i,val){
                        $(val).bind(opts.eventA,function(){
                            opts.direction = i;
                            opts.oldAmount = opts.scrollAmount;
                            opts.scrollAmount = opts.newAmount;
                        }).bind(opts.eventB,function(){
                            opts.scrollAmount = opts.oldAmount;
                        });
                    });
                }
            }else{
                if(opts.isAuto){
                    //轮换开始
                    start();
                    //鼠标划过停止轮换
                    $marquee.hover( stop, start );
                }
                //控制前后走
                if(opts.btnGo){
                    $.each(opts.btnGo, function(i,val){
                        $(val).bind(opts.eventGo,function(){
                            if(isMove == true) return;
                            opts.direction = i;
                            rollFunc();
                            if (opts.isAuto) {
                                stop();
                                start();
                            }
                        });
                    });
                }
            }
            function scrollFunc(){
                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';
                if(opts.isMarquee){
                    if (opts.loop > 0) {
                        numMoved+=opts.scrollAmount;
                        if(numMoved>scrollSize*opts.loop){
                            _scrollObj[_dir] = 0;
                            return clearInterval(marqueeId);
                        }
                    }
                    var newPos = _scrollObj[_dir]+(opts.direction == 'left' || opts.direction == 'up'?1:-1)*opts.scrollAmount;
                }else{
                    if(opts.duration){
                        if(t++<d){
                            isMove = true;
                            var newPos = Math.ceil(easeOutQuad(t,b,c,d));
                            if(t==d){
                                newPos = e;
                            }
                        }else{
                            newPos = e;
                            clearInterval(scrollId);
                            isMove = false;
                            return;
                        }
                    }else{
                        var newPos = e;
                        clearInterval(scrollId);
                    }
                }
                if(opts.direction == 'left' || opts.direction == 'up'){
                    if(newPos>=scrollSize){
                        newPos-=scrollSize;
                    }
                }else{
                    if(newPos<=0){
                        newPos+=scrollSize;
                    }
                }
                _scrollObj[_dir] = newPos;
                if(opts.isMarquee){
                    marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                }else if(t<d){
                    if(scrollId) clearTimeout(scrollId);
                    scrollId = setTimeout(scrollFunc, opts.scrollDelay);
                }else{
                    isMove = false;
                }
            };
            function rollFunc(pPos){
                isMove = true;
                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';
                var _neg = opts.direction == 'left' || opts.direction == 'up'?1:-1;
                numRoll = numRoll +_neg;
                //得到当前所看元素序号并改变导航CSS
                if(pPos == undefined&&opts.navId){
                    $navBtns.eq(numView).removeClass('navOn');
                    numView +=_neg;
                    if(numView>=_len){
                        numView = 0;
                    }else if(numView<0){
                        numView = _len-1;
                    }
                    $navBtns.eq(numView).addClass('navOn');
                    numRoll = numView;
                }
                var _temp = numRoll<0?scrollSize:0;
                t=0;
                b=_scrollObj[_dir];
                //c=(pPos != undefined)?pPos:_neg*opts.distance;
                e=(pPos != undefined)?pPos:_temp+(opts.distance*numRoll)%scrollSize;
                if(_neg==1){
                    if(e>b){
                        c = e-b;
                    }else{
                        c = e+scrollSize -b;
                    }
                }else{
                    if(e>b){
                        c =e-scrollSize-b;
                    }else{
                        c = e-b;
                    }
                }
                d=opts.duration;
                //scrollId = setInterval(scrollFunc, opts.scrollDelay);
                if(scrollId) clearTimeout(scrollId);
                scrollId = setTimeout(scrollFunc, opts.scrollDelay);
            }
            function start(){
                rollId = setInterval(function(){
                    rollFunc();
                }, opts.time*1000);
            }
            function stop(){
                clearInterval(rollId);
            }
            function easeOutQuad(t,b,c,d){
                return -c *(t/=d)*(t-2) + b;
            }
            function easeOutQuint(t,b,c,d){
                return c*((t=t/d-1)*t*t*t*t + 1) + b;
            }
        });
    };
    $.fn.kxbdSuperMarquee.defaults = {
        isMarquee:false,//是否为Marquee
        isEqual:true,//所有滚动的元素长宽是否相等,true,false
        loop: 0,//循环滚动次数，0时无限
        newAmount:3,//加速滚动的步长
        eventA:'mousedown',//鼠标事件，加速
        eventB:'mouseup',//鼠标事件，原速
        isAuto:true,//是否自动轮换
        time:5,//停顿时间，单位为秒
        duration:50,//缓动效果，单次移动时间，越小速度越快，为0时无缓动效果
        eventGo:'click', //鼠标事件，向前向后走
        direction: 'left',//滚动方向，'left','right','up','down'
        scrollAmount:1,//步长
        scrollDelay:10,//时长
        eventNav:'click'//导航事件
    };
    $.fn.kxbdSuperMarquee.setDefaults = function(settings) {
        $.extend( $.fn.kxbdSuperMarquee.defaults, settings );
    };
})(jQuery);